Starts right up no problem, but after a few seconds (RPMS spike to 12-1500 which is usual in cold engine), it drops to about 1000 and then it sounds like it's having trouble breathing, i.e. it sounds like its about to completely stall but when I look at the RPM its solid at 1000. Then I hear it burbling like a tractor. and its all good. I can take a video if you guys want.

Okay I have PPk2 and Performance Exhaust. Not sure if that makes a difference.

After about 10 seconds it completely smooths out. Never a check engine light. No performance issues.

Interesting, I was thinking of posting this exact same thing in the Canadian SE thread.

Mine does this as well. Almost sounds like it's going to stall, but it has not done so yet. Noticeably worse the colder it is out. RPM drops as low as about 500 and then picks right up again.

I also garage mine, but it still gets down into the -20s C. I have a BMW charger and use it occasionally but not regularly. Even after being fully charged the car behaves the same on a cold start.

Since the car runs fine otherwise I figured I would take a video of it and just show the dealer next time I'm in for scheduled maintenance. Don't want to leave the car overnight for them to try and reproduce it.

My last 2011 335 with the N55 (no PPK or PE) did not do this. Since yours does it as well I'm guessing it is related to the PPK. I'll post a link in the other thread to this one. Would like to see if anyone else with the SEs are experiencing this in our Canadian winter.......

Interesting, I was thinking of posting this exact same thing in the Canadian SE thread.

Mine does this as well. Almost sounds like it's going to stall, but it has not done so yet. Noticeably worse the colder it is out. RPM drops as low as about 500 and then picks right up again.

I also garage mine, but it still gets down into the -20s C. I have a BMW charger and use it occasionally but not regularly. Even after being fully charged the car behaves the same on a cold start.

Since the car runs fine otherwise I figured I would take a video of it and just show the dealer next time I'm in for scheduled maintenance. Don't want to leave the car overnight for them to try and reproduce it.

My last 2011 335 with the N55 (no PPK or PE) did not do this. Since yours does it as well I'm guessing it is related to the PPK. I'll post a link in the other thread to this one. Would like to see if anyone else with the SEs are experiencing this in our Canadian winter.......

Maybe it's "normal" as the third poster said.

Exact reason i didn't take it in, I don't want my dealer having it overnight and me being without wheels for a day.

It almost sounds like with the PE there is just so much backpressure it is simply trying to FART out the initial start up exhaust, gets a big clogged, chugs and then smooths out.

Normal for N55? or N55 with PE? Or normal just in winter months for the twin turbo?

Purchased my SE in Calgary (ruby black) its normal for our car, I can't speak for the N54, the N55 doesn't have twin turbos it has a twin scroll but only a single turbo, I wouldn't think the exhaust would have anything to do with the idle, its just a characteristic of the car from what I have read over the past couple of years

I have seen this awhile back around 5k-6k range. I also switched for a couple of weeks to non-Shell premium because the tank was low and needed to fill up. When I went back to Shell, it was fine. I havent seen this happen since last winter.

I have seen this awhile back around 5k-6k range. I also switched for a couple of weeks to non-Shell premium because the tank was low and needed to fill up. When I went back to Shell, it was fine. I havent seen this happen since last winter.

Firstimer-We SE owners in Edmonton should have a coffee meetup one day!

Same thing happened to me during the 2011 holydays (I also have that special ed).

It had been garaged for a couple of days (3-4) without any activity, in a garage kept at 5 degrees celcius. I had to go to the dealership for something else (they scratched the window on the driver's side while installing the tint) so they checked it out. They came to the following conclusion : BAD GAS. The removed the gas in the tank, and filled it up at shell.

They told me (by email) to stop fueling at PETRO-CANADA, and to stop putting in premium fuel, to go to basic fuel. I did that for a couple of months, and went back to premium fuel, I think I get better mileage from premium. Didn't really notice any change in performance though.

So all that being said, it never happend again, with premium, basic, shell, esso, ultramar or even Petro-Canada (sometimes you don't have the choice).

Same exact thing is happening to mine (N54) and it sits in my garage during the winter (garage is not heated, but it's about 30-40 degrees in there), although I do pull it out on clear days when it's dry out but it sounds like its about to die

This morning it was -24 C in the garage (-32 C outside), and it did actually stall, but I was not recording it. Started right up again, and then I gave it some gas to keep it from stalling again. It leveled out after a minute or so.

It's going to be cold again tonight, so tomorrow morning I will make a point of taking another video. However, I'm pretty sure this could not be considered normal. My last N55 car never had this issue in even colder temps.

This morning it was -24 C in the garage (-32 C outside), and it did actually stall, but I was not recording it. Started right up again, and then I gave it some gas to keep it from stalling again. It leveled out after a minute or so.

It's going to be cold again tonight, so tomorrow morning I will make a point of taking another video. However, I'm pretty sure this could not be considered normal. My last N55 car never had this issue in even colder temps.

I really wonder if it has to do with the PPK2 Tuning...its like its starving for gas for a few brief seconds...

*I can't view the video...darn you Work Firewall, will take a look at it at home*

Normal, the engine is trying to warm itself quicker by closing one of the two (2) valves to the exhaust until the engine reaches operating temperature.

Quote:

Originally Posted by morphius909

My Car is garaged, non heated so approx 0 C overnight.

I have her plugged in via CTEK Battery Charger. It's about -20C.

Every morning the past couple of weeks, I get an odd cold start.

Starts right up no problem, but after a few seconds (RPMS spike to 12-1500 which is usual in cold engine), it drops to about 1000 and then it sounds like it's having trouble breathing, i.e. it sounds like its about to completely stall but when I look at the RPM its solid at 1000. Then I hear it burbling like a tractor. and its all good. I can take a video if you guys want.

Okay I have PPk2 and Performance Exhaust. Not sure if that makes a difference.

After about 10 seconds it completely smooths out. Never a check engine light. No performance issues.

N54 but mine does just about the same thing. It's funny I came across this tread cause I've noticed it on mine lately. I've had the car about a year, perhaps I've never really paid attention to it. RPM's will bounce a bit and seems like it wants to stall but it levels out. Must be a 335 thing. Unless I'm throwing a code I try not to fret about it. Stock car btw.

I wonder if it isn't dramatically altering the timing to send still-flaming air/fuel mixture out through the turbos and cats. That's why it sounds so different. I seem to remember reading an article about using huge amounts of timing retard to spool turbos up really quickly and eliminate turbo lag through software "tricks", leading to the nearly lag-less turbos we drive today (compared to the 80s, anyways).

This morning it was -24 C in the garage (-32 C outside), and it did actually stall, but I was not recording it. Started right up again, and then I gave it some gas to keep it from stalling again. It leveled out after a minute or so.

It's going to be cold again tonight, so tomorrow morning I will make a point of taking another video. However, I'm pretty sure this could not be considered normal. My last N55 car never had this issue in even colder temps.

Yeah my RPMS do the same thing..mine just sounds a little worse then years...in yours you can hear the car nearly go silent..my does this 2-3 times before it levels out...